Add new version import format for KSA

[HebaruSan]

Motivation

Kitten Space Agency started its public pre-alpha a few days ago, and there are already some mods on its forum. They're mostly hosted at sites like Google Drive and Mediafire, so @V1TA5 wants to add KSA to SpaceDock. To do that, we'll need a way to query for game version updates, and the KSA devs have helpfully provided this URL for that:

• http://ksa-master1.rocketwerkz.com:8082/

{
  "Version": "2025.11.4.2791",
  "Url": "https://ksa.ahwoo.com/"
}

We can paste that URL into the notifications settings, but the JSON format can't be parsed by any of the existing format options.

Changes

• Now a new json_object format is supported for builds URLs, with the Argument value treated as the property that contains the version. We would set it to Version for KSA.
  
• Now if you edit and save a notification in the admin pages, we immediately trigger retrieval of its versions, so we don't have to wait for the Celery job to run.
• While trying to do dev on this, I discovered that docker-compose is now deprecated and replaced by docker compose. So I did a search-replace for that.
• Docker was complaining about the inconsistent capitalization of FROM x as y, which is now changed to FROM x AS y.

With these changes, my local test server successfully pulled the current version into its GameVersion db.